mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 136

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Pulse-Width Modulator for Motor Control
9.2 Introduction
Advance Information
136
9.10
9.10.1
9.10.2
9.10.3
9.10.4
9.10.5
9.10.6
9.10.7
9.10.8
9.10.9
9.10.10 Fault Acknowledge Register. . . . . . . . . . . . . . . . . . . . . . . . 186
9.10.11 PWM Output Control Register . . . . . . . . . . . . . . . . . . . . . . 187
9.11
This section describes the pulse-width modulator for motor control
(PWMMC, version A). The MC68HC908MR24 PWM module can
generate three complementary PWM pairs or six independent PWM
signals. These PWM signals can be center-aligned or edge-aligned. A
block diagram of the PWM module is shown in
A12-bit timer PWM counter is common to all six channels. PWM
resolution is one clock period for edge-aligned operation and two clock
periods for center-aligned operation. The clock period is dependent on
the internal operating frequency (f
The highest resolution for edge-aligned operation is 125 ns
(f
250 ns (f
When generating complementary PWM signals, the module features
automatic dead-time insertion to the PWM output pairs and transparent
toggling of PWM data based upon sensed motor phase current polarity.
A summary of the PWM registers is shown in
op
Pulse-Width Modulator for Motor Control (PWMMC)
= 8 MHz). The highest resolution for center-aligned operation is
Control Logic Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
PWM Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
op
PWM Counter Registers. . . . . . . . . . . . . . . . . . . . . . . . . . .173
PWM Counter Modulo Registers . . . . . . . . . . . . . . . . . . . . 174
PWM X Value Registers. . . . . . . . . . . . . . . . . . . . . . . . . . .175
PWM Control Register 1. . . . . . . . . . . . . . . . . . . . . . . . . . .176
PWM Control Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . .178
Dead-Time Write-Once Register . . . . . . . . . . . . . . . . . . . . 181
PWM Disable Mapping Write-Once Register . . . . . . . . . . . 181
Fault Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Fault Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
= 8 MHz).
op
) and a programmable prescaler.
Figure
MC68HC908MR24
Figure
Freescale Semiconductor
9-2.
9-1.
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Rev. 4.1